326 
On looking into the literature of the subject, it surprised 
me to find that no detailed account had ever been given beyond 
the allusion before quoted, from “ Siluria,” and a short notice 
in the Proceedings of the Cotteswold Field Club for the year 
1872, Vol: VI, p. 6, in which the then President, Sir W. Guise, 
describes a visit paid by the Members to Tytherington in 1871, 
and their examination of “a very fine section of the Carbon- 
iferous Limestone and Dolomitic Conglomerate, the beds of 
Limestone presenting numerous distortions, and the strata 
dipping away at a considerable angle, on which the Dolomitic 
beds repose in a nearly horizontal position. This cutting 
presents (he goes on to state) very fine examples of the uncon- 
formable position of these two rocks, which tell a tale of long 
lapsed time between the deposition and upheaval of the 
Limestone and its subsequent covering over by the Dolomitic 
deposit. At the Thornbury side of the Tunnel the Conglomer- 
atic character of the deposit is very well shown.” It seems 
that the diagram which Mr Macdonald, the Engineer of the 
line had prepared, was never published in the Proceedings, and 
at the request of your Secretary—who rightly thinks that the 
Cotteswold Club has the first claim—these explanatory notes 
have been prepared with a view to its publication. 
Though admirably drawn to scale, as you might expect 
from an engineer employed by the Midland Railway Co., yet 
there are a few minor details in the geological reading of the 
section requiring alteration, and other additions to be made 
necessitating a fresh survey. This has since been done by 
Mr Meredith, C.E., to whom the Members of the Club as well 
as myself are indebted for the admirable drawing illustrating 
these Notes. 
Immediately on leaving Tytherington Station, a fine 
exposure of Limestone is seen in a quarry on the left hand, 
rising at a high angle from beneath the Gloucestershire Coal 
Field. This is being worked for road metal and other purposes, 
by Mr Hardwicke, a landed proprietor of the adjoining village. 
The beds have a uniform dip of from 30° to 32° S.E., and are 
a conspicuous object in the scenery. 
